@ARTICLE{
       Author = {Mahadevan, P. and Krioukov, D. and Fomenkov, M. and Huffaker, B. and Dimitropoulos, X. and claffy, k. and Vahdat, A.}, 
       Title = {{The Internet AS-Level Topology: Three Data Sources and One Definitive Metric}},
       Journal = {ACM SIGCOMM Computer Communication Review (CCR)}, 
       Volume = {36 No 1},
       Pages = {17-26},
       Month = {Jan},
       Year = {2006},
       Keywords = {topology}
}